5 rules for inexact numbers

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Last updated 2:04 AM on 4/12/26
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10 Terms

1
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Rule 1

All nonzero digits ARE significant

2
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Example for Rule 1

123.45 = 5 significant figures

3
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Rule 2

All digits between significant digits ARE significant

4
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Example for Rule 2

300.3 = 4 significant figures

5
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Rule 3

Zeros that are to the left of all the nonzeros are NOT significant

6
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Example for Rule 3

0.000041 = 2 significant figures

7
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Rule 4

Zeros that are to the RIGHT of the decimal point and to the RIGHT of all nonzeros ARE significant

8
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Example for Rule 4

3.2100 = 5 significant figures

9
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Rule 5

Zeros that are to the LEFT of the decimal and to the RIGHT of all nonzeros MAY be significant

10
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Example of Rule 5

23000 = could have 2, 3, 4, or 5 significant figures